importlib.__import__() now raises ValueError when level < 0.
This is to bring it more in line with what PEP 328 set out to do with
removing ambiguous absolute/relative import semantics.
diff --git a/Misc/NEWS b/Misc/NEWS
index a1810ae..786417f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -466,6 +466,9 @@
 Library
 -------
 
+- Do away with ambiguous level values (as suggested by PEP 328) in
+  importlib.__import__() by raising ValueError when level < 0.
+
 - Issue #2489: pty.spawn could consume 100% cpu when it encountered an EOF.
 
 - Issue #13014: Fix a possible reference leak in SSLSocket.getpeercert().